Greeting, FYI, we noticed a -9.9% regression of will-it-scale.per_process_ops due to commit: commit: e875b81114e876bb6757816c6ed96b2e344579ed ("vfs: Replace array of file pointers with an IDR") git://git.infradead.org/users/willy/linux-dax.git fd-alloc in testcase: will-it-scale on test machine: 32 threads Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz with 64G memory with following parameters: test: lseek2 cpufreq_governor: performance test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two. test-url: https://github.com/antonblanchard/will-it-scale In addition to that, the commit also has significant impact on the following tests: +------------------+------------------------------------------------------------------------+ | testcase: change | will-it-scale: will-it-scale.per_process_ops -10.1% regression | | test machine | 32 threads Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz with 64G memory | | test parameters | cpufreq_governor=performance | | | test=lseek1 | +------------------+------------------------------------------------------------------------+ | testcase: change | will-it-scale: will-it-scale.per_process_ops -15.1% regression | | test machine | 144 threads Intel(R) Xeon(R) CPU E7-8890 v3 @ 2.50GHz with 128G memory | | test parameters | cpufreq_governor=performance | | | test=lseek2 | +------------------+------------------------------------------------------------------------+ | testcase: change | will-it-scale: will-it-scale.per_process_ops -47.3% regression | | test machine | 144 threads Intel(R) Xeon(R) CPU E7-8890 v3 @ 2.50GHz with 128G memory | | test parameters | cpufreq_governor=performance | | | test=dup1 | +------------------+------------------------------------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml testcase/path_params/tbox_group/run: will-it-scale/lseek2-performance/lkp-sb03 f6ece74a1b447fba e875b81114e876bb6757816c6e ---------------- -------------------------- %stddev change %stddev \ | \ 0.66 -9% 0.60 will-it-scale.scalability 9424383 -6% 8841053 will-it-scale.per_thread_ops 16583349 -10% 14944445 will-it-scale.per_process_ops 2078 2114 will-it-scale.time.system_time 431 -8% 395 will-it-scale.time.user_time 0.01 -7% 0.01 perf-stat.branch-miss-rate% 17123 ± 21% 128% 38981 ± 17% perf-stat.instructions-per-iTLB-miss 24270584 80% 43651045 ± 48% perf-stat.dTLB-store-misses 0.84 15% 0.97 perf-stat.ipc 1.341e+13 14% 1.536e+13 perf-stat.instructions 2.802e+12 5% 2.953e+12 perf-stat.dTLB-stores 3.021e+12 9% 3.288e+12 perf-stat.branch-instructions 3.952e+12 5% 4.148e+12 perf-stat.dTLB-loads 9.638e+09 ± 7% -65% 3.401e+09 ± 22% perf-stat.iTLB-loads 8.336e+08 ± 27% -51% 4.056e+08 ± 16% perf-stat.iTLB-load-misses perf-stat.instructions 1.6e+13 O+-O-O-OO-O-OO-O-OO-OO-O-OO-O-OO-O-OO-O-OO-O------O---------------+ | O OO O | 1.4e+13 *+**.*.**.*.**.*.**.** **.*.**.*.**.* *.*.**.*.**.**.*.**.*.**.* 1.2e+13 ++ : : : : | | : : : : | 1e+13 ++ : : : : | | : : : : | 8e+12 ++ : : : : | | : : : : | 6e+12 ++ : : :: | 4e+12 ++ : : :: | | :: : | 2e+12 ++ : : | | : : | 0 ++---------------------*----------------*-------------------------+ perf-stat.ipc 1 O+O-OO-O-O-OO-O-O-OO-O-O-OO-O-O-OO-O-O-OO-O-O-OO---O-O----------------+ 0.9 ++ O | *.*.**.*.*.**.*.*.**.*.* *.*.*.**.*.*.** *.**.*.*.**.*.*.**.*.*.**.* 0.8 ++ : : : : | 0.7 ++ : : : : | | : : : : | 0.6 ++ : : : : | 0.5 ++ : : : : | 0.4 ++ : : : : | | :: : : | 0.3 ++ :: : : | 0.2 ++ : :: | | : : | 0.1 ++ : : | 0 ++-----------------------*----------------*---------------------------+ will-it-scale.per_process_ops 1.8e+07 ++----------------------------------------------------------------+ *.**.*.**.*.**.*.**.** **.*.**.*.**.* *.*.**.*.**.**.*.**.*.**.* 1.6e+07 ++ OO O OO OO O OO O OO O OO O OO O OO O O | 1.4e+07 O+OO O OO O : : : : | | : : : : | 1.2e+07 ++ : : : : | 1e+07 ++ : : : : | | : : : : | 8e+06 ++ : : :: | 6e+06 ++ : : :: | | : : :: | 4e+06 ++ : : | 2e+06 ++ : : | | : : | 0 ++---------------------*----------------*-------------------------+ will-it-scale.per_thread_ops 1e+07 ++------------------------------------------------------------------+ 9e+06 *+**.*.*.**.*.**.O.*O.O O **.*.**.*.**.* **.*.**.*.**.*.*.**.*.**.* O OO O O OO O OO O : OO O OO O OO O O OO O OO O | 8e+06 ++ : : : : | 7e+06 ++ : : : : | | : : : : | 6e+06 ++ : : : : | 5e+06 ++ : : : : | 4e+06 ++ : : : : | | : : : : | 3e+06 ++ : : : : | 2e+06 ++ : : | | : : | 1e+06 ++ : : | 0 ++----------------------*----------------*--------------------------+ [*] bisect-good sample [O] bisect-bad sample Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. Thanks, Xiaolong